Operation:
This upgrade will work with different types of tailcap switchs such as forward tactical click switches, momentary switches, and reverse click switches. Select modes by quickly turning the light on and off (it will cycle through High->Medium->Low). Leave the light on the desired mode for more that 2 seconds to set the memory. When the light is turned back on it will be on the memory level last set.

Nice surefire drop in. Very floody with a not so pronounced hotspot but very bright.it would be better to have a smooth reflector to increase the throw. Unique orange peeling seems to be a factor in the floody beam. My light never runs hot even on high for extended periods of time.overall a great drop in for the money. Great battery saver too,if you are used to incandescent\'s poor runtimes.